Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina

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The Striated Caracara (Phalcoboenus australis) is a poorly known raptor associated with seabird colonies, restricted to the islands of southern South America, and with an estimated extant population of <2,500 mature individuals. We evaluated the number of breeding pairs, described the characteris...

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Autores principales: Balza, U., Lois, N.A., Raya Rey, A.
Formato: JOUR
Materias:
Breeding output
Invasive species
Nest site availability
Spatial analysis
breeding population
brood size
colony
habitat availability
invasive species
nest site
nest structure
raptor
reproductive biology
reproductive success
seabird
spatial analysis
Argentina
Canada
Franklin Bay
Northwest Territories
South America
Capra aegagrus
Caracara
Cervus elaphus
Falconidae
Phalcoboenus australis
Raptores
Spheniscidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15594491_v129_n4_p890_Balza
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15594491_v129_n4_p890_Balza
record_format dspace
spelling todo:paper_15594491_v129_n4_p890_Balza2023-10-03T16:26:20Z Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina Balza, U. Lois, N.A. Raya Rey, A. Breeding output Invasive species Nest site availability Spatial analysis breeding population brood size colony habitat availability invasive species nest site nest structure raptor reproductive biology reproductive success seabird spatial analysis Argentina Canada Franklin Bay Northwest Territories South America Capra aegagrus Caracara Cervus elaphus Falconidae Phalcoboenus australis Raptores Spheniscidae The Striated Caracara (Phalcoboenus australis) is a poorly known raptor associated with seabird colonies, restricted to the islands of southern South America, and with an estimated extant population of <2,500 mature individuals. We evaluated the number of breeding pairs, described the characteristics and spatial pattern of nest sites, and estimated breeding output of a population of Striated Caracaras in Franklin Bay, Staten Island, Argentina. We found one of the lower breeding density values reported for this species, although this population is associated with one of the biggest colonies of Rockhopper Penguins. The main material used for the construction of Striated Caracaras' nests was tussac grass, though only half of nests were placed in grassland. The spatial pattern for nest sites corresponds with global and local clustering. All successful Striated Caracaras' nests were at least 250 m from the nearest neighboring nest, were generally closer to the colony of Rockhopper Penguins than failed nests, and had more Rockhopper patches around them. Breeding success was 0.73 successful nests/active nests, productivity was 1.27 ± 1.01 young/active nest, and brood size was 1.75 ± 0.71 young/successful nest. The presence of invasive wild goats and red deer is proposed as a factor that could be restricting nest site availability in the study area. © 2017 Wilson Ornithological Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15594491_v129_n4_p890_Balza
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Breeding output
Invasive species
Nest site availability
Spatial analysis
breeding population
brood size
colony
habitat availability
invasive species
nest site
nest structure
raptor
reproductive biology
reproductive success
seabird
spatial analysis
Argentina
Canada
Franklin Bay
Northwest Territories
South America
Capra aegagrus
Caracara
Cervus elaphus
Falconidae
Phalcoboenus australis
Raptores
Spheniscidae
spellingShingle Breeding output
Invasive species
Nest site availability
Spatial analysis
breeding population
brood size
colony
habitat availability
invasive species
nest site
nest structure
raptor
reproductive biology
reproductive success
seabird
spatial analysis
Argentina
Canada
Franklin Bay
Northwest Territories
South America
Capra aegagrus
Caracara
Cervus elaphus
Falconidae
Phalcoboenus australis
Raptores
Spheniscidae
Balza, U.
Lois, N.A.
Raya Rey, A.
Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
topic_facet Breeding output
Invasive species
Nest site availability
Spatial analysis
breeding population
brood size
colony
habitat availability
invasive species
nest site
nest structure
raptor
reproductive biology
reproductive success
seabird
spatial analysis
Argentina
Canada
Franklin Bay
Northwest Territories
South America
Capra aegagrus
Caracara
Cervus elaphus
Falconidae
Phalcoboenus australis
Raptores
Spheniscidae
description The Striated Caracara (Phalcoboenus australis) is a poorly known raptor associated with seabird colonies, restricted to the islands of southern South America, and with an estimated extant population of <2,500 mature individuals. We evaluated the number of breeding pairs, described the characteristics and spatial pattern of nest sites, and estimated breeding output of a population of Striated Caracaras in Franklin Bay, Staten Island, Argentina. We found one of the lower breeding density values reported for this species, although this population is associated with one of the biggest colonies of Rockhopper Penguins. The main material used for the construction of Striated Caracaras' nests was tussac grass, though only half of nests were placed in grassland. The spatial pattern for nest sites corresponds with global and local clustering. All successful Striated Caracaras' nests were at least 250 m from the nearest neighboring nest, were generally closer to the colony of Rockhopper Penguins than failed nests, and had more Rockhopper patches around them. Breeding success was 0.73 successful nests/active nests, productivity was 1.27 ± 1.01 young/active nest, and brood size was 1.75 ± 0.71 young/successful nest. The presence of invasive wild goats and red deer is proposed as a factor that could be restricting nest site availability in the study area. © 2017 Wilson Ornithological Society. All rights reserved.
format JOUR
author Balza, U.
Lois, N.A.
Raya Rey, A.
author_facet Balza, U.
Lois, N.A.
Raya Rey, A.
author_sort Balza, U.
title Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
title_short Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
title_full Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
title_fullStr Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
title_full_unstemmed Status and Reproductive Outcome of the Breeding Population of Striated Caracaras (Phalcoboenus australis) at Franklin Bay, Staten Island, Argentina
title_sort status and reproductive outcome of the breeding population of striated caracaras (phalcoboenus australis) at franklin bay, staten island, argentina
url http://hdl.handle.net/20.500.12110/paper_15594491_v129_n4_p890_Balza
work_keys_str_mv AT balzau statusandreproductiveoutcomeofthebreedingpopulationofstriatedcaracarasphalcoboenusaustralisatfranklinbaystatenislandargentina
AT loisna statusandreproductiveoutcomeofthebreedingpopulationofstriatedcaracarasphalcoboenusaustralisatfranklinbaystatenislandargentina
AT rayareya statusandreproductiveoutcomeofthebreedingpopulationofstriatedcaracarasphalcoboenusaustralisatfranklinbaystatenislandargentina
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